![]() This generates what is known as a sinewave. As noted above, it reverses 120 times per second, having a positive charge for half the cycle and negative the other half. ![]() How often that change in polarity takes place per second is known as frequency, measured in Hertz (and often referred to as cycles), and in the US power system, it is 60 times per second or 60 Hertz (aka 60-cycle) electricity. This, of course, is the electricity that comes off the power grid. It doesn’t fluctuate like AC (alternating current) does, and which is constantly changing in magnitude and direction, switching from positive to negative and back again. It has a positive and negative pole that never change. Why are they rated lower for AC than DC, or why are they rated higher for DC than AC? Anybody ever wonder about that? I hope somebody has!ĭC (direct current like your car battery) is a constant voltage. Class 00, for example, is rated 500 Vac/750 Vdc. Nelson, Electrical Specialist CESCP, CESW Certified You will notice that gloves are rated in AC and DC voltages. DC – What is the difference? Written by: Craig F. Used Test Equipment: Refurbished & SurplusĪC vs.Instrumentation & Calibration Test Equip.
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